The deal had been expected as early as Sunday but was delayed, seemingly due to negotiations over the terms of the option to buy.

PSG, having already signed Neymar from Barcelona for £200.6m this summer, insisted on the initial loan season so as not to fall foul of UEFA’s Financial Fair Play regulations.

Monaco were believed to be pushing for an obligation on PSG’s part to complete the transfer next summer, in order to have certainty over a reported fee of 180million euros (£166m), but when the deal was announced it was phrased as an option to buy.

Arsene Wenger speaks to Des Kelly after Arsenal's goalless draw with West Ham at the London ...

Arsene Wenger speaks to Des Kelly after Arsenal's goalless draw with West Ham at the London Stadium and blames fatigue a...

Arsene Wenger speaks to Des Kelly after Arsenal's goalless draw with West Ham at the London St...

Arsene Wenger speaks to Des Kelly after Arsenal's goalless draw with West Ham at the London Stadium and blames fatigue after a three day turnaround from their last Premier League match, for their inability to break the Hammers down.

Arsene Wenger speaks to Des Kelly after Arsenal's goalless draw with West Ham at the London Stadium and blames fatigue after a three day turnaround from their last Premier League match, for their inability to break the Hammers down.

Arsene Wenger speaks to Des Kelly after Arsenal's goalless draw with West Ham at the London Stadium and blames fatigue after a three day turnaround from their last Premier League match, for their inability to break the Hammers down.